fix pam authorization (go-gitea#19040)

https://huntr.dev/bounties/8d221f92-b2b1-4878-bc31-66ff272e5ceb/

Co-authored-by: ysf <[email protected]>

Author: 2 people

modules/auth/pam/pam.go

@@ -35,6 +35,10 @@ func Auth(serviceName, userName, passwd string) (string, error) {
 	if err = t.Authenticate(0); err != nil {
 		return "", err
 	}
+	
+	if err = t.AcctMgmt(0); err != nil {
+	  return "", err
+  }
 
 	// PAM login names might suffer transformations in the PAM stack.
 	// We should take whatever the PAM stack returns for it.